774 DIPTERA OP AUSTRALIA, 



or black. "Wings pellucid, with a slightly greyish tint, and rather 



indistinctly clouded with brownish ; two very pale spots in first 



basal cell, one mid-way between humeral cross-vein and origin of 



prsefurca, the other immediately beneath origin of praefurca ; 



bases and tips of all the veins, and the cross- veins, more or less 



distinctly clouded ; stigma elliptical, pale brownish ; veins dark 



brown, the costa more fulvous. Auxiliary vein reaching the costa 



beyond the origin of second longitudinal vein a distance about 



equal to length of stigma ; sub-costal cross-vein about midway 



between origin of second longitudinal vein and tip of auxiliary 



vein ; marginal cross- vein close to tip of second longitudinal vein ; 



prsefurca about twice the length of the distance between origin of 



third longitudinal vein and small cross-vein ; discal cell closed, the 



great cross-vein a little before its inner end. 



Hah. — Hexham Swamps, near Newcastle, N. S. W. ; April 



(Skuse). 



Genus 2. Thrypticomyia, gen. nov. 



One sub-marginal cell ; four posterior cells ; discal cell present ; 

 marginal cross-vein before tip of first longitudinal vein ; tip of 

 auxiliary vein opposite origin of second longitudinal vein ; 

 prsefurca as long as sub-marginal cell ; a supernumerary cross-vein 

 between the costa and the auxiliary vein. Wings lanceolate, very 

 narrow towards the base. Antennae 14:-joined, joints sub-cylin- 

 drical ; joints pedicelled ; each joint with a moderately long stiff 

 hair above (PL xxiv, fig. 45). Proboscis very short. Feet slender ; 

 tibiae without spurs; ungues extremely minute with a tooth near the 

 base ; empodia wanting. Forceps of male similar to those of Bicran- 

 omyia (PI. xxiv, fig. 44); two fleshy lobes with a horny style under 

 them. 



This genus though undoubtedly very closely allied to Dicran- 

 omyia may be readily distinguished by the structure of the 

 antennae, the cuneiformly narrowed base of the wings which has 

 not the slightest indication of an anal angle, by the greater length 

 of the first longitudinal vein and position of the marginal cross- 

 vein, and lastly by the presence of a supernumerary sub-costal 

 cross-vein. 



